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<h1 class="title">movieplayer.cpp 示例文件</h1>
<span class="subtitle">widgets/movie/movieplayer.cpp</span>
<!-- $$$widgets/movie/movieplayer.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>

  <span class="preprocessor">#include &quot;movieplayer.h&quot;</span>

  MoviePlayer<span class="operator">::</span>MoviePlayer(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
  {
      movie <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span>(<span class="keyword">this</span>);
      movie<span class="operator">-</span><span class="operator">&gt;</span>setCacheMode(<span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>CacheAll);

      movieLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;No movie loaded&quot;</span>));
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored);
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Dark);
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setAutoFillBackground(<span class="keyword">true</span>);

      currentMovieDirectory <span class="operator">=</span> <span class="string">&quot;movies&quot;</span>;

      createControls();
      createButtons();

      connect(movie<span class="operator">,</span> SIGNAL(frameChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateFrameSlider()));
      connect(movie<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>MovieState))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(updateButtons()));
      connect(fitCheckBox<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(fitToWindow()));
      connect(frameSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(goToFrame(<span class="type">int</span>)));
      connect(speedSpinBox<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
              movie<span class="operator">,</span> SLOT(setSpeed(<span class="type">int</span>)));

      mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(movieLabel);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(controlsLayout);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(buttonsLayout);
      setLayout(mainLayout);

      updateFrameSlider();
      updateButtons();

      setWindowTitle(tr(<span class="string">&quot;Movie Player&quot;</span>));
      resize(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>open()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Open a Movie&quot;</span>)<span class="operator">,</span>
                                 currentMovieDirectory);
      <span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
          openFile(fileName);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>openFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
  {
      currentMovieDirectory <span class="operator">=</span> <span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>path();

      movie<span class="operator">-</span><span class="operator">&gt;</span>stop();
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setMovie(movie);
      movie<span class="operator">-</span><span class="operator">&gt;</span>setFileName(fileName);
      movie<span class="operator">-</span><span class="operator">&gt;</span>start();

      updateFrameSlider();
      updateButtons();
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>goToFrame(<span class="type">int</span> frame)
  {
      movie<span class="operator">-</span><span class="operator">&gt;</span>jumpToFrame(frame);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>fitToWindow()
  {
      movieLabel<span class="operator">-</span><span class="operator">&gt;</span>setScaledContents(fitCheckBox<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>updateFrameSlider()
  {
      bool hasFrames <span class="operator">=</span> (movie<span class="operator">-</span><span class="operator">&gt;</span>currentFrameNumber() <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span>);

      <span class="keyword">if</span> (hasFrames) {
          <span class="keyword">if</span> (movie<span class="operator">-</span><span class="operator">&gt;</span>frameCount() <span class="operator">&gt;</span> <span class="number">0</span>) {
              frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(movie<span class="operator">-</span><span class="operator">&gt;</span>frameCount() <span class="operator">-</span> <span class="number">1</span>);
          } <span class="keyword">else</span> {
              <span class="keyword">if</span> (movie<span class="operator">-</span><span class="operator">&gt;</span>currentFrameNumber() <span class="operator">&gt;</span> frameSlider<span class="operator">-</span><span class="operator">&gt;</span>maximum())
                  frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(movie<span class="operator">-</span><span class="operator">&gt;</span>currentFrameNumber());
          }
          frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(movie<span class="operator">-</span><span class="operator">&gt;</span>currentFrameNumber());
      } <span class="keyword">else</span> {
          frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">0</span>);
      }
      frameLabel<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasFrames);
      frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasFrames);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>updateButtons()
  {
      playButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(movie<span class="operator">-</span><span class="operator">&gt;</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</span> movie<span class="operator">-</span><span class="operator">&gt;</span>frameCount() <span class="operator">!</span><span class="operator">=</span> <span class="number">1</span>
                             <span class="operator">&amp;</span><span class="operator">&amp;</span> movie<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>NotRunning);
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(movie<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>NotRunning);
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setChecked(movie<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>Paused);
      stopButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(movie<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qmovie.html">QMovie</a></span><span class="operator">::</span>NotRunning);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>createControls()
  {
      fitCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>(tr(<span class="string">&quot;Fit to Window&quot;</span>));

      frameLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Current frame:&quot;</span>));

      frameSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
      frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setTickPosition(<span class="type"><a href="qslider.html">QSlider</a></span><span class="operator">::</span>TicksBelow);
      frameSlider<span class="operator">-</span><span class="operator">&gt;</span>setTickInterval(<span class="number">10</span>);

      speedLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Speed:&quot;</span>));

      speedSpinBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qspinbox.html">QSpinBox</a></span>;
      speedSpinBox<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">1</span><span class="operator">,</span> <span class="number">9999</span>);
      speedSpinBox<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="number">100</span>);
      speedSpinBox<span class="operator">-</span><span class="operator">&gt;</span>setSuffix(tr(<span class="string">&quot;%&quot;</span>));

      controlsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
      controlsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(fitCheckBox<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      controlsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(frameLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
      controlsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(frameSlider<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      controlsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(speedLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span>);
      controlsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(speedSpinBox<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
  }

  <span class="type">void</span> MoviePlayer<span class="operator">::</span>createButtons()
  {
      <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> iconSize(<span class="number">36</span><span class="operator">,</span> <span class="number">36</span>);

      openButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
      openButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(style()<span class="operator">-</span><span class="operator">&gt;</span>standardIcon(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>SP_DialogOpenButton));
      openButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
      openButton<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(tr(<span class="string">&quot;Open File&quot;</span>));
      connect(openButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));

      playButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
      playButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(style()<span class="operator">-</span><span class="operator">&gt;</span>standardIcon(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>SP_MediaPlay));
      playButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
      playButton<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(tr(<span class="string">&quot;Play&quot;</span>));
      connect(playButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> movie<span class="operator">,</span> SLOT(start()));

      pauseButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(style()<span class="operator">-</span><span class="operator">&gt;</span>standardIcon(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>SP_MediaPause));
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
      pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(tr(<span class="string">&quot;Pause&quot;</span>));
      connect(pauseButton<span class="operator">,</span> SIGNAL(clicked(bool))<span class="operator">,</span> movie<span class="operator">,</span> SLOT(setPaused(bool)));

      stopButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
      stopButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(style()<span class="operator">-</span><span class="operator">&gt;</span>standardIcon(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>SP_MediaStop));
      stopButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
      stopButton<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(tr(<span class="string">&quot;Stop&quot;</span>));
      connect(stopButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> movie<span class="operator">,</span> SLOT(stop()));

      quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
      quitButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(style()<span class="operator">-</span><span class="operator">&gt;</span>standardIcon(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>SP_DialogCloseButton));
      quitButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
      quitButton<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(tr(<span class="string">&quot;Quit&quot;</span>));
      connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));

      buttonsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(openButton);
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(playButton);
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(pauseButton);
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(stopButton);
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(quitButton);
      buttonsLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();
  }

</pre>
</div>
<!-- @@@widgets/movie/movieplayer.cpp -->
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